Yitong Graben:a Typical Petroliferous Strike-Slip Fault Depression of China

作     者：Chen Quanmao Zhang GuangyaChina University of Geosciences , Wuhan 430074 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：1993年第12卷第1期

页      面：88-93页

核心收录：

学科分类：0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 

主　　题：depression strike-slip fault fault sag fault bulge extensional rate. 

摘      要：Although Yitong graben appears in a rift basin region of Eastern China , it is really not a rift basin but a strike-slip depression . Its features are as follows : (1 ) graben is controlled by both east and west boundary fauns without any relationship with Mono discontinuity figure ; (2 ) there is no alkalic or calc-alkalic igneous rocks in the layer of early and middle period of graben development ; (3 )west boundary fault is a typical strike-slip fault with some what of arc along the strike , and the fault depression locates in the concave of the arc . East boundary fault is a syndepostional normal fault with translational motion ; (4 ) graben has a long and narrow shape with four sags and three bulges alternating each other ; (5 ) the cross section of graben is asymmetric , high in the east and low in the west ; (6 )the lithofacies changes are quite fast in the cross section . Unconfonnities exist in some area of graben ; (7 )the angle between fault 2 and west boundary fault is a acute angle directing the opposite trend of the west side motion of boundary fault ; (8 )the extensional rate of graben is about 12% , less than the rate in Huabei (19%) and Liaohe (20 %)rift basin.